He had a vague impression of rain pounding on the packed earth.他隐约记得雨点打在坚实地面上的情景。Their name comes from South Africa's Afrikaans language and means " earth pig. "他们的名字源于南非的荷兰语意思是 “ 泥猪 ”.The earth should be elliptical...
Automatic Gain Control ( AGC ) is widely used in communication. radar & amp ; instrumentation systems.自动增益控制 ( AGC ) 环路广泛地应用于通信、雷达 、 仪器系统.There is a radar net in our area.在我们那个地区有一个雷达网。The application of wide - band digi...